The Method and Application of Enhanced Exploitation Control for Offshore Oilfield with High Water Cut and High Recovery Degree

Aiming at the problem of stable production in the "double high" stage of Bohai Q Oilfield entering high water cut and high recovery degree, the method of enhanced exploitation control is proposed to improve the water driving level in the layer by reasonably increasing the production pressure difference. Based on the analysis of the heterogeneity in the layer and the relationship between the driving pressure gradient and the threshold pressure gradient, from the perspective of the effective driving of low permeability reservoirs, the relationship between the reasonable production pressure difference and the mobility under different well spacings is established. Applying this relationship, it is proposed that the production pressure difference of Bohai Q Oilfield will increase from 2.0 MPa to 5.0 MPa. This method has achieved good results in Bohai Q Oilfield. The effect of single well "precipitation and oil increase" is obvious. The daily production is stable at 200 m³/d for 5 years and the oil recovery ratio is increased by 4%.This method can provide reference for subsequent oilfield development.